netdev - Re: [PATCH net-next] tcp: TCP_NOSENT

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Message-ID: <1374543203.4990.102.camel@edumazet-glaptop>
Date:	Mon, 22 Jul 2013 18:33:23 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc:	Rick Jones <rick.jones2@...com>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Yuchung Cheng <ycheng@...gle.com>,
	Neal Cardwell <ncardwell@...gle.com>,
	Michael Kerrisk <mtk.manpages@...il.com>
Subject: Re: [PATCH net-next] tcp: TCP_NOSENT_LOWAT socket option

On Tue, 2013-07-23 at 03:20 +0200, Hannes Frederic Sowa wrote:
> On Mon, Jul 22, 2013 at 05:40:13PM -0700, Eric Dumazet wrote:
> > On Mon, 2013-07-22 at 17:13 -0700, Eric Dumazet wrote:
> > 
> > > 
> > >  Performance counter stats for './netperf -H 10.246.17.84 -l 20 -t TCP_SENDFILE -c':
> > > 
> > >            714,395 context-switches                                            
> > 
> > Hmm, actually I need to send a v3, because sk_stream_write_space() is
> > waking sockets too often.
> 
> Do you implement SO_SNDLOWAT? :)

Not exactly.

This is going to be a FAQ I guess ;)


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